SOLUTION: The sum of the digits of a two digit number is 15. If the digits are reversed, the result exceeds the original number by 9.Find the original number.
I think the first equation is
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I think the first equation is
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Question 305753: The sum of the digits of a two digit number is 15. If the digits are reversed, the result exceeds the original number by 9.Find the original number.
I think the first equation is: x + y = 15 Answer by mananth(16946) (Show Source):
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Let the digits in the units place be y
in tens place be x
when reversed
10y+x-9=10x+y
9y-9x=9
.
y-x=1
y+x=15
2y=16
y=8
x= 7
The number is 78
